I did this a little while ago using the maps from AutoRoute 2006. Annoyingly, MapPoint can't find my work postcode on the 2006 map (it was on the '04 one), but routing seems to have improved; it now finds more shortcuts rather than taking you the long way round.

AH....But will it have direction up, snap to road abd auto reroute if a wrong turn is taken like other programs have. This keep me from it now. Nothing worse then finding myself off into the bushes near the road I'm on.